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How to ignore maven's Plugin execution not covered by lifecycle configuration warning

There are times when you want to ignore some of maven warnings or errors. To do so, normally we add the ff code in the parent project's pom.xml.

For example to ignore liferay's theme-merge and build-thumbnail goal warning.

<pluginManagement>
 <plugins>
  <plugin>
   <groupId>org.eclipse.m2e</groupId>
   <artifactId>lifecycle-mapping</artifactId>
   <version>1.0.0</version>
   <configuration>
    <lifecycleMappingMetadata>
     <pluginExecutions>
      <pluginExecution>
       <pluginExecutionFilter>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-antrun-plugin</artifactId>
        <versionRange>[1.7,)</versionRange>
        <goals>
         <goal>run</goal>
        </goals>
       </pluginExecutionFilter>
       <action>
        <ignore />
       </action>
      </pluginExecution>
      <pluginExecution>
       <pluginExecutionFilter>
        <groupId>com.liferay.maven.plugins</groupId>
        <artifactId>liferay-maven-plugin</artifactId>
        <versionRange>[6.1.0,)</versionRange>
        <goals>
         <goal>theme-merge</goal>
         <goal>build-thumbnail</goal>
        </goals>
       </pluginExecutionFilter>
       <action>
        <ignore />
       </action>
      </pluginExecution>
     </pluginExecutions>
    </lifecycleMappingMetadata>
   </configuration>
  </plugin>
 </plugins>
</pluginManagement>

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